本篇論文提出「以有效的模糊C-平均值演算法(Fuzzy C-Means, FCM)分析馬達電流訊號與辨識馬達的品質類別」。本論文是將FCM演算法應用於辨識馬達的品質類別為例說明。辨識過程簡述如下：(i)首先，從已知品質類別的樣本馬達中，取得各種品質類別的輸入訊號，並分別計算在各種不同品質類別之主要特徵點的特徵值向量；(ii)其次，執行FCM演算法，並計算在所有不同品質類別中，每一個品質類別之最終的群體中心值；(iii)接著，計算下列兩者之間的歐氏距離，它們分別是：待辨識馬達之主要特徵點的特徵值向量，及每一種品質類別之最終的群體中心值；(iv)最後，依據計算得到的歐氏距離，決定該待辨識馬達之品質類別是屬於何種類別。若是屬於“品質類別-z”，條件是在所有的品質類別中，該待辨識馬達的主要特徵值向量，它與“品質類別-z”之最終的群體中心值，兩者之間的歐氏距離是最小的值。本篇論文經過多次的測試，證實以模糊C-平均值演算法應用於分析電流訊號與辨識馬達的品質類別，是一個有效且實用的方法。

This dissertation proposes a novel Fuzzy C-Means (FCM) algorithm for determining the motors’ quality types by analyzing their current waveforms. The determining process of motors’ quality types are listed as follows: (i) Obtaining input current signals of sample motors with well-known distinct classes and then calculating their feature values of qualitative features; (ii) Computing centroid values of each quality class; (iii) Computing Euclidean distances of their feature values and centroid values of classes; and (iv) Determining motors’ quality types using obtained Euclidean distances. A motor belongs to a class-z if it and class-z has the minimum Euclidean distance. Experimental results show that the proposed FSM algorithm is an effective quality determining method for motors.

摘　　要......................................................................i
Abstract......................................................................ii
誌　　謝......................................................................iii
表目錄..........................................................................v
圖目錄..........................................................................vi
第一章 前言..................................................................1
第二章 模糊C-平均值分群演算法(FCM)的回顧...............4
第三章 FCM演算法的應用：辨識直流馬達的品質類別.....6
3.1 主要特徵點的定義....................................................7
3.2計算樣本馬達之各主要特徵點在各種馬達品質類別的特徵值範圍 ....................................................................................9
3.3計算樣本馬達之各主要特徵點在各種馬達品質類別的最終群體中心值................................................................................12
3.4 決定待測試馬達之最終品質類別..............................14
第四章 性能評估...........................................................18
4.1實驗一：辨識單一週期之馬達電流訊號的品質類別.....18
4.2實驗二：辨識單一顆馬達的品質類別........................20
4.3實驗三：正確辨識率................................................21
第五章 結論..................................................................23
參考文獻......................................................................24
簡 歷.........................................................................27

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